Drill-chuck.



J. BRADLEY.

DRILL CHUCK.

APPLICATION FILED APR.18, 1907.

933,741. Patented Sept. 14, 1909.

W/T/VESSES :25: UVVEIVTOH A YTOHNEYS UNITED STATES PATENT OFFICE.

JOSIAH BRADLEY, OF WALTHAM,

MASSACHUSETTS, ASSIGNOR TO '1. R. ALMOND MANU- FACTURING 00., OFBROOKLYN, NEW YORK, A CORPORATION OF NEW YORK.

DRILL-CHUCK.

Specification of Letters Patent.

Patented Sept. 14, 1909.

Application filed April 18, 1907. Seria1 No. 368,818.

To all whom "it may concern:

Be it known that I, JosIArr BRADLEY, a citizen of the United States, anda resident of \Valtham, in the county of Middlesex and State ofMassachusetts, have invented certain new and useful Improvements inDrill- Chucks, of which the following is a specification.

My invention relates to drill chucks, particularly of the kind in whichthe position of the jaws is controlled by the rotation of a key, and hasfor its object to provide a construction of this character in which themoving parts are well protected and efliciently located.

A typical embodiment of my invention is represented in the accompanyingdrawings, in which-Figure 1 is an elevation of the chuck, with partsbroken away; Fig. 2 is a central vertical section; Fig. 3 is a detailface View ofa pinion forming part of the adjusting mechanism; and Fig. 4shows the said pinion in longitudinal section and in engagement with theoperating key.

The chuck body A shown in the drawings has a conical end A to receivethe tool shank and the jaws B which'move in converging slideways or jawrecesses A and are provided with exterior screw-threads engaged by thesectional nut C contained in a groove or nut recess A of the body A. Thenut is generally made of hard steel. The nut G is a ring trapezoidal incross section and threaded on its oblique inner surface. A ferrule Dsurrounds the body A and holds the nut sections together, beingconnected with the nut G rigidly and projecting in advance of it for apurpose to be stated hereinafter.

The'forward face of the nut which is the broader one of its parallelsurfaces is formed with bevel teeth C, engaging those of a bevel pinionE provided with a stem E fitting into an opening or socket A of the bodyA, while the pinion E lies within a recess A The forward edge of theferrule D not only conceals and protects the nut C, but keeps the pinionE in position and partly shields the same. This ferrule in projecting infront of the meshing teeth of the pinion effectively obviates all dangerof the workingmens garments being caught in that portion of theapparatus as it rapidly revolves. The opening or socket A which maycommunicate with the axial bore of the body in which the I ing apermanent ,on the key) is always in perfect mesh with tool shank isreceived, is disposed at an acute angle to the axis of the chuck, andprefer ably perpendicular to the outer surface of the conical end A.

The pinion E has a centrally located surface, generally an axial hole orrecess of angular shape (a square recess is shown) which is adapted toreceive the correspondingly formed end F of a key F, by means of whichthe pinion E and nut C may be rotated to adjust the jaws B toward orfrom each other. In order that the inner end of the key may be kept fromcontact with the jaws B, I prefer to provide a suitable stop; forinstance, the outer end of the recess E may be flared at the corners, asindicated at E the key F having a corresponding flare or shoulder F Theferrule or sleeve D is shown as externally roughened so as to be capableof rotation by hand. In this operation the pinion E will rotate freelywithout affecting the mechanism of the chuck. It is obvious that thesleeve D and the nut C may, in some modifications of this structure, beintegral, and, therefore, when in my claims I refer to the nut alone, Iintend to be understood as including the sleeve with the nut, as well asan integral nut. It will also be seen that the upper surface of the nutC bears against the annular lower surface of the recess A The lower edge'of the nut O being serrated presents a series of depressions andprojections forming teeth having separate functions; the projectionsretain the nut in place in the nut recess by bearing upon the lowersurface of the nut recess; the depressions present bearing surfaces forengagement with the pinion. The lower surface of the nut recess issubstantially annular in shape, its surface being interrupted, where thepinion engages with the teeth on the nut.

It will be seen that the key used in my invention is of very simpleconstruction and takes up very little room. The pinion E, be-

part of the chuck (and not the nut teeth G, being held in properposition by the ferrule D, which also covers the meshing portion of thepinion and nut, and thus practically forms a gear case. Putting the gearteeth C on the nut G is more satisfactory than placing them on theferrule D,

as the latter is generally made of softer material and therefore wouldbe subject to greater wear.

Various modifications may be made without departing from the nature ofmy invention as set forth in the appended claims.

I claim:

1. The combination of the chuck body having guideways converging towardone of its ends, an axial bore to receive the tool shank, and anexternal socket arranged obliquely with respect to said bore, jawsarranged in said guideways, a nut for operating the jaws,

provided with teeth on the side next to said socket, a pinion fittedwithin said socket and meshing with said. nut teeth, said pinion hav,

ing a key receiving surface, and a ferrule connected with said nut andprojecting in front of the meshing teeth of the pinion.

' 2. The combination of the chuck body, the jaws, the rotatablejaw-adjusting member provided with teeth, the pinion journaled in thechuck body and meshing with said teeth, said pinion having akey-receiving surface, and the ferrule connected with said member andprojecting in front of the meshing teeth of the pinion.

8. A drill chuck having a body comprising an annular outwardly openingnut recess one surface of which presents an interrupted annular surface,axially inclined jaw recesses in the body, jaws movable in the jawremovable in the nut recess having on one of its surfaces which isadapted to be engaged by the nut recess a regular succession of teeth,the said teeth bearing upon the annular interrupted face of the nutrecess, the nut also having interior. threads engaging with the threadson the jaws, a gear permanently journaled in the chuck projecting intothe gap of theinterrupted annular face of the nut recess and meshingwith the teeth of the nut, and having means adaptedto be engaged by anoperating key and means for retaining the nut upon the chuck bodycomprising a rotatable sleeve encircling the body of the chuck connectedwith said nut and capable of rotation by hand, said sleeve'projecting infront of the meshing teeth of the pinion but not in front of the keyengaging means.

In testimony whereof, I have hereunto subscribed my name in the presenceof two subscribing witnesses.

Or'ro V. SOHRENK, JOHN A. KEI-ILENBEGK.

